US20140007741A1 - Integrated drive generator gear alignment - Google Patents
Integrated drive generator gear alignment Download PDFInfo
- Publication number
- US20140007741A1 US20140007741A1 US13/542,767 US201213542767A US2014007741A1 US 20140007741 A1 US20140007741 A1 US 20140007741A1 US 201213542767 A US201213542767 A US 201213542767A US 2014007741 A1 US2014007741 A1 US 2014007741A1
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- Prior art keywords
- shaft
- shafts
- biasing
- integrated drive
- another
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/32—Arrangement, mounting, or driving, of auxiliaries
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/72—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/40—Transmission of power
- F05D2260/403—Transmission of power through the shape of the drive components
- F05D2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
- F05D2260/40311—Transmission of power through the shape of the drive components as in toothed gearing of the epicyclical, planetary or differential type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19149—Gearing with fluid drive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19851—Gear and rotary bodies
- Y10T74/19856—Laterally-spaced wheels
Definitions
- This disclosure relates to an integrated drive generator for use with an aircraft engine, for example.
- the disclosure relates to a means of aligning gears.
- One example type of integrated drive generator includes a generator, a hydraulic unit and a differential assembly arranged in a common housing.
- the differential assembly is operatively coupled to a gas turbine engine via an input shaft.
- the rotational speed of the input shaft varies during the operation of the gas turbine engine.
- the hydraulic unit cooperates with the differential assembly to provide a constant speed to the generator throughout engine operation.
- One example of a hydraulic unit incorporates nested coaxial shafts, each having a gear.
- the gears are arranged adjacent to one another and are coupled to the differential assembly.
- One gear receives a variable rotational input from the input shaft, and the other gear provides a fixed rotational output from the hydraulic unit. Due to packaging constraints, gear widths and loading, the gears could undesirably contact one another during operation of the IDG.
- a gear assembly includes first and second shafts concentric with one another. First and second gears are respectively provided by the first and second shafts and are arranged adjacent to one another. A biasing assembly cooperates with at least one of the first and second shafts to maintain a desired gap between the first and second gears.
- the biasing assembly includes a loading member and a biasing element.
- the loading member engages an end of one of the first and second shafts and the biasing element urges the loading member against the end.
- the gear assembly includes a third shaft coaxial with the first and second shafts and a hollow receiving the biasing assembly.
- the second shaft is arranged within the first shaft.
- the second shaft provides the end.
- the biasing assembly includes a retainer.
- First and second spring seats are respectively provided by the loading member and the retainer.
- the biasing element includes a helical spring engaging the first and second spring seats.
- the third shaft is rotationally fixed relative to the second shaft with a splined connection.
- the splined connection permits the second and third shafts to slide axially relative to one another.
- the gear assembly includes a bearing supporting an end of the second shaft opposite the splined connection.
- the gear assembly includes pairs of bearings supporting each of the second and third shafts.
- an integrated drive generator in another exemplary embodiment, includes a housing enclosing a generator.
- the integrated drive generator includes a hydraulic unit and a differential assembly.
- the hydraulic unit and differential assembly are configured to cooperate with one another and convert a variable speed and provide a fixed speed to the generator.
- the hydraulic unit includes first and second shafts concentric with one another.
- First and second gears are respectively provided by the first and second shafts and arranged adjacent to one another.
- a biasing assembly cooperates with at least one of the first and second shafts to maintain a desired gap between the first and second gears.
- the integrated drive generator includes an input shaft configured to receive a variable speed and provide the variable speed to the hydraulic unit and the differential assembly.
- the second shaft is a variable speed shaft.
- the first shaft is a trim speed shaft.
- the integrated drive generator includes a pump plate separating first and second pumping assemblies.
- Each hydraulic unit includes a wobbler and pistons.
- the biasing assembly includes a loading member and a biasing element.
- the loading member engages an end of one of the first and second shafts and the biasing element urges the loading member against the end.
- a third shaft coaxial with the first and second shafts and includes a hollow receiving the biasing assembly.
- the second shaft is arranged within the first shaft.
- the second shaft provides the end.
- the biasing assembly includes a retainer.
- First and second spring seats are respectively provided by the loading member and the retainer.
- the biasing element includes a helical spring engaging the first and second spring seats.
- the third shaft is rotationally fixed relative to the second shaft with a splined connection.
- the splined connection permits the second and third shafts to slide axially relative to one another.
- a bearing supporting an end of the second shaft opposite the splined connection.
- the integrated drive generator includes pairs of bearings supporting each of the second and third shafts.
- a method of spacing adjacent gears includes the steps of providing concentric shafts having adjacent gears laterally spaced from one another, and biasing the shafts relative to one another to maintain a desired gap between the first and second gears.
- the biasing step includes operatively engaging an end of one of the shafts with a helical spring.
- the providing step includes coupling a third shaft to the second shaft with a splined connection.
- the helical spring is arranged within the third shaft.
- FIG. 1 is a highly schematic view of a generator system.
- FIG. 2 is a cross-sectional schematic view of an example integrated drive generator.
- FIG. 3 is a schematic perspective view of a generator, a hydraulic unit and a differential assembly of the integrated drive generator shown in FIG. 2 .
- FIG. 4 is a cross-sectional view through the hydraulic unit.
- FIG. 1 An example generator system 10 is schematically illustrated in FIG. 1 .
- the system 10 includes a gas turbine engine 12 that provides rotational drive to an integrated drive generator (IDG) 16 through an accessory drive gearbox 14 mounted on the gas turbine engine 12 .
- the accessory drive gearbox 14 is coupled to a spool of the engine 12 , and the speed of the spool varies throughout engine operation.
- the IDG 16 includes a housing 18 having generator, center and input housing portions 20 , 22 , 24 secured to one another.
- a generator 40 is arranged in the generator housing portion 20 .
- Seal plates 23 are provided on either side of the center housing 22 to seal the center housing 22 relative to the generator and input housing portions 20 , 24 .
- An input shaft 26 receives rotational drive from the accessory drive gearbox 14 .
- the rotational speed of the input shaft 26 varies depending upon the operation of the engine 12 .
- a hydraulic unit 32 cooperates with the differential assembly 28 to convert the variable rotational speed from the input shaft 26 to provide a fixed rotational output speed to the generator 40 .
- the input shaft 26 rotationally drives a differential input gear 30 that is coupled to a hydraulic input gear 34 of the hydraulic unit 32 .
- the differential input gear 30 is operatively coupled to the input shaft 26 by the disconnect assembly 27 .
- the hydraulic output gear 36 is coupled to a differential trim gear 38 .
- the hydraulic unit 32 increases or decreases the rotational speed provided to the differential assembly 28 from the hydraulic output gear 36 to provide a fixed rotational output speed, such as a 12,000 rpm speed.
- the variable rotational speed of the differential input gear 30 combines with the speed of the differential trim gear 38 to provide a fixed rotational speed to a generator input shaft 42 .
- a geartrain 44 cooperates with the generator input shaft 42 , which rotates at a constant speed to rotationally drive a charge pump 46 , deaerator 48 , main scavenge pump 50 , inversion pump 52 and generator scavenge pump 54 .
- charge pump 46 deaerator 48
- deaerator 48 main scavenge pump 50
- inversion pump 52 inversion pump 52
- generator scavenge pump 54 generator scavenge pump 54
- the hydraulic unit 32 includes a can 60 that houses and provides structural support for the hydraulic unit components.
- Trim and variable speed shafts 62 , 64 are arranged coaxially with and nested relative to one another on one side of the hydraulic unit 32 .
- the hydraulic input gear 34 is provided by the variable speed shaft 64
- the hydraulic output gear 36 is provided by the trim speed shaft 62 .
- the hydraulic input and trim gears 34 , 36 are laterally adjacent to one another and spaced laterally apart from one another by a gap 80 .
- a speed change shaft 72 is also arranged within the can 60 and is coaxial with the fixed and variable speed shafts 62 , 64 .
- a pump plate 66 separates first and second pumping assemblies 68 , 70 , which each include a wobbler and pistons. The pumping assemblies cooperate with one another to increase or decrease the rotational speed of the trim speed shaft 62 .
- a first bearing 74 supports the trim speed shaft 62 relative to the can 60
- a second bearing 76 supports the other end of the trim speed shaft 62 relative to the pump plate 66
- Another second bearing 76 supports the speed change shaft 72 relative to the pump plate 66
- a third bearing 78 supports the other end of the speed change shaft 72 relative to the center housing 22
- a fourth bearing 79 supports the variable speed shaft 64 relative to the input housing 24 .
- variable speed shaft 64 and the speed change shaft 72 are rotationally fixed relative to one another via a splined connection 82 , which provides a slip fit connection.
- the splined connection 82 permits the variable and speed change shafts 64 , 72 to move axially relative to one another.
- the variable speed shaft 64 includes an end 84 .
- a biasing assembly is arranged within a hollow of the speed change shaft 72 to cooperate with the variable speed shaft 64 , in the example, and maintain a desired gap 80 between the hydraulic input and output gears 34 , 36 .
- the biasing assembly includes a loading member 86 that abuts the end 84 .
- a retainer 94 is received within a groove 96 within the speed change shaft 72 .
- a biasing element 88 for example, a helical spring, engages first and second spring seats 90 , 92 , which are respectively provided by the loading member 86 and the retainer 94 .
- the biasing element 88 acts on the loading member 86 to urge the variable speed shaft 64 rightward (as depicted in FIG. 4 ) and space the hydraulic input and output gears 34 , 36 apart from one another to maintain the desired gap 80 .
Abstract
Description
- This disclosure relates to an integrated drive generator for use with an aircraft engine, for example. In particular, the disclosure relates to a means of aligning gears.
- One example type of integrated drive generator (IDG) includes a generator, a hydraulic unit and a differential assembly arranged in a common housing. The differential assembly is operatively coupled to a gas turbine engine via an input shaft. The rotational speed of the input shaft varies during the operation of the gas turbine engine. The hydraulic unit cooperates with the differential assembly to provide a constant speed to the generator throughout engine operation.
- One example of a hydraulic unit incorporates nested coaxial shafts, each having a gear. The gears are arranged adjacent to one another and are coupled to the differential assembly. One gear receives a variable rotational input from the input shaft, and the other gear provides a fixed rotational output from the hydraulic unit. Due to packaging constraints, gear widths and loading, the gears could undesirably contact one another during operation of the IDG.
- In one exemplary embodiment, a gear assembly includes first and second shafts concentric with one another. First and second gears are respectively provided by the first and second shafts and are arranged adjacent to one another. A biasing assembly cooperates with at least one of the first and second shafts to maintain a desired gap between the first and second gears.
- In a further embodiment of any of the above, the biasing assembly includes a loading member and a biasing element. The loading member engages an end of one of the first and second shafts and the biasing element urges the loading member against the end.
- In a further embodiment of any of the above, the gear assembly includes a third shaft coaxial with the first and second shafts and a hollow receiving the biasing assembly. The second shaft is arranged within the first shaft. The second shaft provides the end.
- In a further embodiment of any of the above, the biasing assembly includes a retainer. First and second spring seats are respectively provided by the loading member and the retainer. The biasing element includes a helical spring engaging the first and second spring seats.
- In a further embodiment of any of the above, the third shaft is rotationally fixed relative to the second shaft with a splined connection. The splined connection permits the second and third shafts to slide axially relative to one another.
- In a further embodiment of any of the above, the gear assembly includes a bearing supporting an end of the second shaft opposite the splined connection.
- In a further embodiment of any of the above, the gear assembly includes pairs of bearings supporting each of the second and third shafts.
- In another exemplary embodiment, an integrated drive generator includes a housing enclosing a generator. The integrated drive generator includes a hydraulic unit and a differential assembly. The hydraulic unit and differential assembly are configured to cooperate with one another and convert a variable speed and provide a fixed speed to the generator. The hydraulic unit includes first and second shafts concentric with one another. First and second gears are respectively provided by the first and second shafts and arranged adjacent to one another. A biasing assembly cooperates with at least one of the first and second shafts to maintain a desired gap between the first and second gears.
- In a further embodiment of any of the above, the integrated drive generator includes an input shaft configured to receive a variable speed and provide the variable speed to the hydraulic unit and the differential assembly.
- In a further embodiment of any of the above, the second shaft is a variable speed shaft. The first shaft is a trim speed shaft.
- In a further embodiment of any of the above, the integrated drive generator includes a pump plate separating first and second pumping assemblies. Each hydraulic unit includes a wobbler and pistons.
- In a further embodiment of any of the above, the biasing assembly includes a loading member and a biasing element. The loading member engages an end of one of the first and second shafts and the biasing element urges the loading member against the end.
- In a further embodiment of any of the above, a third shaft coaxial with the first and second shafts and includes a hollow receiving the biasing assembly. The second shaft is arranged within the first shaft. The second shaft provides the end.
- In a further embodiment of any of the above, the biasing assembly includes a retainer. First and second spring seats are respectively provided by the loading member and the retainer. The biasing element includes a helical spring engaging the first and second spring seats.
- In a further embodiment of any of the above, the third shaft is rotationally fixed relative to the second shaft with a splined connection. The splined connection permits the second and third shafts to slide axially relative to one another.
- In a further embodiment of any of the above, a bearing supporting an end of the second shaft opposite the splined connection.
- In a further embodiment of any of the above, the integrated drive generator includes pairs of bearings supporting each of the second and third shafts.
- In another exemplary embodiment, a method of spacing adjacent gears includes the steps of providing concentric shafts having adjacent gears laterally spaced from one another, and biasing the shafts relative to one another to maintain a desired gap between the first and second gears.
- In a further embodiment of any of the above, the biasing step includes operatively engaging an end of one of the shafts with a helical spring.
- In a further embodiment of any of the above, the providing step includes coupling a third shaft to the second shaft with a splined connection. The helical spring is arranged within the third shaft.
- The disclosure can be further understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
-
FIG. 1 is a highly schematic view of a generator system. -
FIG. 2 is a cross-sectional schematic view of an example integrated drive generator. -
FIG. 3 is a schematic perspective view of a generator, a hydraulic unit and a differential assembly of the integrated drive generator shown inFIG. 2 . -
FIG. 4 is a cross-sectional view through the hydraulic unit. - An
example generator system 10 is schematically illustrated inFIG. 1 . Thesystem 10 includes agas turbine engine 12 that provides rotational drive to an integrated drive generator (IDG) 16 through anaccessory drive gearbox 14 mounted on thegas turbine engine 12. Theaccessory drive gearbox 14 is coupled to a spool of theengine 12, and the speed of the spool varies throughout engine operation. - Referring to
FIGS. 2 and 3 , an example IDG 16 is illustrated. In the example, theIDG 16 includes ahousing 18 having generator, center andinput housing portions generator 40 is arranged in thegenerator housing portion 20.Seal plates 23 are provided on either side of thecenter housing 22 to seal thecenter housing 22 relative to the generator andinput housing portions - An
input shaft 26 receives rotational drive from theaccessory drive gearbox 14. The rotational speed of theinput shaft 26 varies depending upon the operation of theengine 12. To this end, as a result, ahydraulic unit 32 cooperates with thedifferential assembly 28 to convert the variable rotational speed from theinput shaft 26 to provide a fixed rotational output speed to thegenerator 40. - The
input shaft 26 rotationally drives adifferential input gear 30 that is coupled to ahydraulic input gear 34 of thehydraulic unit 32. Thedifferential input gear 30 is operatively coupled to theinput shaft 26 by thedisconnect assembly 27. Thehydraulic output gear 36 is coupled to adifferential trim gear 38. Thehydraulic unit 32 increases or decreases the rotational speed provided to thedifferential assembly 28 from thehydraulic output gear 36 to provide a fixed rotational output speed, such as a 12,000 rpm speed. The variable rotational speed of thedifferential input gear 30 combines with the speed of thedifferential trim gear 38 to provide a fixed rotational speed to agenerator input shaft 42. - In the example, a
geartrain 44 cooperates with thegenerator input shaft 42, which rotates at a constant speed to rotationally drive acharge pump 46,deaerator 48,main scavenge pump 50,inversion pump 52 and generator scavengepump 54. Thus, these components may be designed efficiently to operate at a fixed speed. - Referring to
FIG. 4 , thehydraulic unit 32 includes acan 60 that houses and provides structural support for the hydraulic unit components. Trim andvariable speed shafts hydraulic unit 32. Thehydraulic input gear 34 is provided by thevariable speed shaft 64, and thehydraulic output gear 36 is provided by thetrim speed shaft 62. The hydraulic input and trim gears 34, 36 are laterally adjacent to one another and spaced laterally apart from one another by agap 80. - A
speed change shaft 72 is also arranged within thecan 60 and is coaxial with the fixed andvariable speed shafts pump plate 66 separates first andsecond pumping assemblies trim speed shaft 62. - A
first bearing 74 supports thetrim speed shaft 62 relative to thecan 60, and asecond bearing 76 supports the other end of thetrim speed shaft 62 relative to thepump plate 66. Anothersecond bearing 76 supports thespeed change shaft 72 relative to thepump plate 66, and athird bearing 78 supports the other end of thespeed change shaft 72 relative to thecenter housing 22. Afourth bearing 79 supports thevariable speed shaft 64 relative to theinput housing 24. - The
variable speed shaft 64 and thespeed change shaft 72 are rotationally fixed relative to one another via asplined connection 82, which provides a slip fit connection. Thesplined connection 82 permits the variable andspeed change shafts variable speed shaft 64 includes anend 84. A biasing assembly is arranged within a hollow of thespeed change shaft 72 to cooperate with thevariable speed shaft 64, in the example, and maintain a desiredgap 80 between the hydraulic input and output gears 34, 36. - The biasing assembly includes a
loading member 86 that abuts theend 84. Aretainer 94 is received within agroove 96 within thespeed change shaft 72. A biasingelement 88, for example, a helical spring, engages first and second spring seats 90, 92, which are respectively provided by the loadingmember 86 and theretainer 94. The biasingelement 88 acts on theloading member 86 to urge thevariable speed shaft 64 rightward (as depicted inFIG. 4 ) and space the hydraulic input and output gears 34, 36 apart from one another to maintain the desiredgap 80. - Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of the claims. For that reason, the following claims should be studied to determine their true scope and content.
Claims (20)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/542,767 US8925421B2 (en) | 2012-07-06 | 2012-07-06 | Integrated drive generator gear alignment |
CN201310280805.1A CN103527714B (en) | 2012-07-06 | 2013-07-05 | The gear alignment of Integrated Driven Generator |
Applications Claiming Priority (1)
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US13/542,767 US8925421B2 (en) | 2012-07-06 | 2012-07-06 | Integrated drive generator gear alignment |
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US20140007741A1 true US20140007741A1 (en) | 2014-01-09 |
US8925421B2 US8925421B2 (en) | 2015-01-06 |
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US13/542,767 Active 2033-02-08 US8925421B2 (en) | 2012-07-06 | 2012-07-06 | Integrated drive generator gear alignment |
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CN (1) | CN103527714B (en) |
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US20170004595A1 (en) * | 2015-06-30 | 2017-01-05 | The Boeing Company | Rewarding a user for providing safety hazard information |
US9797397B2 (en) | 2015-09-04 | 2017-10-24 | Hamilton Sundstrand Corporation | Pump sleeve |
US9863416B2 (en) | 2015-09-04 | 2018-01-09 | Hamilton Sundstrand Corporation | Triangular pump cover |
US10100673B2 (en) | 2015-09-04 | 2018-10-16 | Hamilton Sundstrand Corporation | Pump gear |
EP3467349A1 (en) * | 2017-10-03 | 2019-04-10 | Hamilton Sundstrand Corporation | Accessory drive gear for integrated drive generator |
US20230049420A1 (en) * | 2021-08-10 | 2023-02-16 | Zf Friedrichshafen Ag | Gearwheel for reducing structure-borne sound in electric drives |
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US10344845B2 (en) | 2015-04-02 | 2019-07-09 | Hamilton Sundstrand Corporation | Sun gear for an integrated drive generator |
US9759305B2 (en) | 2015-04-02 | 2017-09-12 | Hamilton Sundstrand Corporation | Planet gear for an integrated drive generator |
US9709157B2 (en) | 2015-04-03 | 2017-07-18 | Hamilton Sundstrand Corporation | Carrier shaft for a differential |
US9470302B1 (en) | 2015-04-03 | 2016-10-18 | Hamilton Sundstrand Corporation | Accessory drive gear for a differential |
US9695926B2 (en) | 2015-04-03 | 2017-07-04 | Hamilton Sundstrand Corporation | Accessory drive gear hub for a differential |
US10024413B2 (en) | 2015-04-03 | 2018-07-17 | Hamilton Sundstrand Corporation | Input driven gear for a differential |
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US20190219139A1 (en) * | 2018-01-15 | 2019-07-18 | Hamilton Sundstrand Corporation | Fixed block shaft for integrated drive generator |
US11668352B2 (en) * | 2019-06-10 | 2023-06-06 | Honda Motor Co., Ltd. | Final drive assembly, powertrain for a vehicle, and method of containing a shaft |
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US4734590A (en) * | 1986-12-30 | 1988-03-29 | Sundstrand Corporation | Integrated drive generator with common center line |
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US20130288840A1 (en) * | 2012-04-26 | 2013-10-31 | Hamilton Sundstrand Corporation | Integrated drive generator having a variable input speed and constant output frequency and method of driving |
US20140009126A1 (en) * | 2012-07-06 | 2014-01-09 | Henry R. Vanderzyden | Integrated drive generator pump plate |
US20140009125A1 (en) * | 2012-07-06 | 2014-01-09 | Henry R. Vanderzyden | Integrated drive generator housing |
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US20230049420A1 (en) * | 2021-08-10 | 2023-02-16 | Zf Friedrichshafen Ag | Gearwheel for reducing structure-borne sound in electric drives |
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US8925421B2 (en) | 2015-01-06 |
CN103527714A (en) | 2014-01-22 |
CN103527714B (en) | 2017-06-23 |
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